''método para a fabricação de placas de impressão por entalhe para a produção de papéis de segurança e sistema de gravação a laser para a manufatura de placas de impressão por entalhe para a produção de papéis de segurança''

摘要

There is described a method for manufacturing intaglio printing plates for the production of security papers, wherein a laser beam (2) is used to engrave intaglio patterns (3, 3.1, 3.2, 3.3) directly into the surface of a laser-engravable, especially metallic, printing plate medium (1), wherein laser engraving of the printing plate medium (1) is carried out in several individual engraving steps performed one after the other in register so that the intaglio patterns (3, 3.1, 3.2, 3.3) are gradually engraved into the surface of the printing plate medium (1) up to desired engraving depths, the surface of the engraved printing plate medium (1) being cleaned from residues of the laser engraving process following each individual engraving step.